One-way bypass valve of excavator hydraulic system and excavator hydraulic system

Abstract

The utility model discloses a one-way bypass valve of an excavator hydraulic system and the excavator hydraulic system. The one-way bypass valve of the excavator hydraulic system comprises a valve body, a valve element, a supporting spring and a temperature control spring. A runner is arranged on the valve body, an inlet and an outlet are formed in the two ends of the runner respectively, and a valve block located at the outlet of the runner is arranged on the valve element. The two ends of the supporting spring abut against the valve body and the valve element correspondingly, and the supporting spring is used for applying elastic stress to the valve element so that the valve block of the valve element can block the outlet of the flow channel. The temperature control spring is arranged between the valve body and the valve element and used for applying elastic stress to the valve element at the preset temperature so as to push the valve plate of the valve element towards the outlet of the flow channel. According to the utility model, the oil temperature rising time can be reduced at low temperature, and the aim of daily protecting the radiator at high temperature is fulfilled.

Description

TECHNICAL FIELD

[0001] The utility model relates to engineering machinery technical field, concretely relates to a one-way by pass valve of excavator hydraulic system and excavator hydraulic system. BACKGROUND

[0002] In the hydraulic system of the excavator, the oil discharged by the main pump enters two parallel one-way valves after the main valve, one of the two one-way valves with a smaller pressure setting value serves as a back pressure valve to provide normal demand of the hydraulic system, the oil passing through the one-way valve enters the radiator for heat dissipation, and the other one-way valve with a larger pressure setting value serves as a by pass valve to shunt when the flow is too large to avoid too much oil flowing through the radiator to cause the radiator cracking.

[0003] When starting the machine in cold weather, the oil needs to be quickly warmed up to above 20 DEG, and in practice, most of the oil still enters the radiator through the back pressure valve, and the temperature rises slowly, and the vehicle is in a working condition or poor lubrication for a long time. CONTENT OF THE UTILITY MODEL

[0004] In view of the defects of the prior art, the utility model aims at providing a one-way by pass valve of excavator hydraulic system, which has a relatively small opening pressure when the oil temperature is low to reduce the oil temperature rising time, and has a relatively high opening pressure when the oil temperature is high to achieve the purpose of protecting the radiator.

[0005] The utility model aims at providing a excavator hydraulic system.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The one-way by pass valve of excavator hydraulic system comprises a valve body, a valve core, a supporting spring and a temperature control spring.

[0008] The valve body is provided with a flow channel, and the two ends of the flow channel form an inlet and an outlet respectively, and the valve core is provided with a valve plate located at the outlet of the flow channel; the two ends of the supporting spring abut against the valve body and the valve core respectively, and the supporting spring is used to apply elastic stress to the valve core to make the valve plate of the valve core block the outlet of the flow channel; the temperature control spring is arranged between the valve body and the valve core, and is used to apply elastic stress to the valve core at a predetermined temperature to push the valve plate of the valve core towards the outlet of the flow channel.

[0009] The valve body is fixedly connected with a guide rod extending along the axial direction of the valve body, and the valve core movably sleeves the guide rod to make the valve core have the freedom of moving relative to the valve body along the extension direction of the guide rod.

[0010] The support seat is sleeved on the guide rod so that the support seat has the freedom of movement along the extension direction of the guide rod, a support nut is screwed on the guide rod, and the support nut abuts against one side of the support seat away from the valve body.

[0011] The support seat is sleeved on the guide rod so that the support seat has the freedom of movement along the extension direction of the guide rod, a support nut is screwed on the guide rod, and the support nut abuts against one side of the support seat away from the valve body.

[0012] The end surface of the valve core away from the valve body is provided with a first groove recessed towards the valve body, the support seat is provided with a second groove recessed towards the direction away from the valve body, and the two ends of the temperature control spring are embedded in the first groove and the second groove, respectively.

[0013] The end surface of the valve core away from the valve body is provided with a first groove recessed towards the valve body, the support seat is provided with a second groove recessed towards the direction away from the valve body, and the two ends of the temperature control spring are embedded in the first groove and the second groove, respectively.

[0014] The middle part of the valve body is formed with a support, the support is provided with a threaded hole, and the guide rod is arranged in the threaded hole to be fixedly connected with the valve body.

[0015] The valve body comprises an annular part surrounding the periphery of the support, a plurality of connecting ribs extending along the radial direction of the valve body are arranged between the annular part and the support, and a flow channel is formed between adjacent connecting ribs.

[0016] To achieve the above-mentioned purposes, the utility model adopts the following technical scheme:

[0017] The excavator hydraulic system comprises the one-way bypass valve of the excavator hydraulic system.

[0018] The utility model has the advantages of:

[0019] In the utility model, when the oil temperature is low, the opening pressure of the one-way bypass valve is low, the oil is branched, the heat emission in the oil can be reduced, and the oil temperature rising time is reduced. When the oil temperature is high, the temperature control spring and the support spring jointly act, the opening pressure of the one-way bypass valve is improved, and the one-way bypass valve can meet the purpose of daily protection of the radiator. DRAWINGS

[0020] Figure 1 It is a structural schematic view of the utility model;

[0021] Figure 2 It is an assembly schematic view of the utility model;

[0022] Figure 3This is a cross-sectional view of the present invention;

[0023] Figure 4 This is a schematic diagram of one working state of the present invention;

[0024] Figure 5 This is a schematic diagram of another working state of the present invention. Detailed Implementation

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:

[0026] like Figure 1 , 2 As shown in Figure 3, this utility model discloses a one-way bypass valve for an excavator hydraulic system. It includes a valve body 10, a valve core 20, a support spring 30, and a temperature control spring 40. The valve body 10 is provided with a flow channel 11, which extends from one end of the valve body 10 to the other end. One end of the flow channel 11 forms an inlet 111 at one end face of the valve body 10 and an outlet 112 at the other end face 12 of the valve body 10. The valve core 20 is located at the end face 12 of the valve body 20, and a valve plate 21 is provided on the valve core 20 that abuts against the end face 12. That is, the valve plate 21 is located at the outlet 112 of the flow channel 11. The two ends of the support spring 30 abut against the valve body 10 and the valve core 20, respectively. The support spring 30 applies an elastic stress to the valve core 20 so that the valve plate 21 of the valve core 20 abuts against the end face 12 of the valve body 10, thereby blocking the outlet 112 of the flow channel 11. The temperature control spring 40 is placed between the valve body 10 and the valve core 20. It is used to apply an elastic stress to the valve core 20 at a predetermined temperature to push the valve core 20 toward the outlet 112 of the flow channel 11. Specifically, when the oil temperature in the excavator hydraulic system rises to the predetermined temperature, the temperature control spring 40 is affected by the oil temperature and deforms due to heat. This causes the two ends of the temperature control spring 40 to abut against the valve body 10 and the valve core 20 respectively, thereby applying an elastic stress to the valve core 20.

[0027] like Figure 4 As shown, when the hydraulic fluid temperature in the excavator's hydraulic system is relatively low, the temperature control spring 40 does not apply elastic stress to the valve core 20. The hydraulic fluid flows through the flow channel 11, applying pressure to the valve core 20. At this time, the support spring 30 is compressed, and the opening pressure of the valve core 20 is relatively low. A portion of the hydraulic fluid flows through the one-way bypass valve and does not flow through the hydraulic system's radiator, reducing heat dissipation and thus reducing the time required for the hydraulic fluid temperature to rise. Figure 5 As shown, when the oil temperature in the excavator's hydraulic system is relatively high, the temperature control spring 40 applies an elastic force to the valve core 20. The temperature control spring 40, together with the support spring 30, pushes the valve core 20 together, resulting in a relatively high opening pressure for the valve core 20. The one-way bypass valve can meet the daily protection purpose of the radiator.

[0028] In this invention, when the oil temperature is low, the opening pressure of the one-way bypass valve is low, which diverts the oil flow and reduces the heat dissipation in the oil, thereby reducing the time for the oil temperature to rise. When the oil temperature is high, the temperature control spring and the support spring work together to increase the opening pressure of the one-way bypass valve, so that the one-way bypass valve can meet the purpose of protecting the radiator in daily use.

[0029] In a preferred embodiment, a guide rod 13 extending axially along the valve body 10 is fixedly connected to the valve body 10. The valve core 20 is movably sleeved on the guide rod 13, allowing the valve core 20 to move relative to the valve body 10 along the axial direction of the guide rod 13. This allows the valve core 20 to move between a first position abutting against the end face 12 and a second position separated from the end face 12, thus opening and closing the one-way bypass valve. A support seat 14 is provided at the end of the guide rod 13 away from the valve body 10. The support spring 30 and the temperature control spring 40 are both sleeved on the outside of the guide rod 13. The ends of the support spring 30 and the temperature control spring 40 away from the valve body 10 abut against the support seat 14. The support seat 14 provides support for the support spring 30 and the temperature control spring 40. That is, the support spring 30 is pressed between the valve core 20 and the support seat 14. When the temperature reaches the predetermined temperature, the temperature control spring 40 is pressed between the valve core 20 and the support seat 14. In the low temperature state, the temperature control spring 40 only contacts the support seat 14.

[0030] The support seat 14 is adjustable on the guide rod 13, meaning the distance between the support seat 14 and the valve core 20 is adjustable. This changes the compression of the support spring 30 and the allowable space for the deformation of the temperature control spring 40. Specifically, the support seat 14 is sleeved on the guide rod 13, giving it freedom of movement relative to the valve body 10 in the extension direction of the guide rod 13. A support nut 15 is screwed onto the guide rod 13, abutting against the side of the support seat 14 away from the valve body 10. Rotating the support nut 15 pushes the support spring 30 and the temperature control spring 40 toward the valve core 20, thereby increasing the opening pressure of the one-way bypass valve. Conversely, rotating the support nut 15 moves it away from the valve body 10, reducing the opening pressure of the one-way bypass valve.

[0031] The valve core 20 has a first groove 22 recessed towards the valve body 10 on the end face away from the valve body 10, and the support seat 14 has a second groove 141 recessed away from the valve body 10. The two ends of the temperature control spring 40 are respectively embedded in the first groove 22 and the second groove 141. When the temperature rises to the predetermined temperature, one end of the temperature control spring 40 abuts against the inner end wall 221 of the first groove 22 and the other end abuts against the inner end wall 1411 of the second groove 141. One end of the support spring 30 abuts against the valve plate 21 of the valve core 20, and the other end abuts against the end face 142 of the support seat 14 near the valve body 10. A spacer 50 is provided between the valve core 20 and the support seat 14. The spacer 50 is sleeved on the outside of the guide rod 13. The temperature control spring 40 is located inside the spacer 50, and the support spring 40 is sleeved on the outside of the spacer 50. The spacer separates the support spring 30 and the temperature control spring 40 to avoid mutual interference and improve the stability of the one-way bypass valve.

[0032] A bracket 104 is formed in the middle of the valve body 10. A threaded hole is provided on the bracket 104. The guide rod 13 passes through the threaded hole. An external thread is opened at a predetermined position of the guide rod 13. The guide rod 13 is fixed on the bracket 104 by the cooperation of the external thread and the internal thread in the threaded hole.

[0033] The valve body 10 includes an annular portion 101 surrounding the periphery of the support 104. A plurality of connecting ribs 103 extending radially along the valve body 10 are provided between the annular portion 101 and the support 104. A flow channel 11 is formed between adjacent connecting ribs 103, thereby forming a plurality of flow channels 11 on the valve body 10.

[0034] The excavator hydraulic system of this utility model includes the one-way bypass valve of the excavator hydraulic system described above. The other structures of the excavator hydraulic system are the same as those in the prior art and will not be described in detail here.

[0035] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A one-way bypass valve for an excavator hydraulic system, characterized in that, Includes valve body, valve core, support spring, and temperature control spring; The valve body is provided with a flow channel, with an inlet and an outlet at both ends of the flow channel. A valve plate is provided on the valve core at the outlet of the flow channel. The two ends of the support spring abut against the valve body and the valve core respectively. It is used to apply elastic stress to the valve core so that the valve plate of the valve core blocks the outlet of the flow channel. The temperature control spring is placed between the valve body and the valve core. It is used to apply elastic stress to the valve core at a predetermined temperature so that the valve plate of the valve core is pushed towards the outlet of the flow channel.

2. The one-way bypass valve of the excavator hydraulic system as described in claim 1, characterized in that, A guide rod extending axially along the valve body is fixedly connected to the valve body, and the valve core is movably sleeved on the guide rod so that the valve core has the freedom to move relative to the valve body along the extension direction of the guide rod.

3. The one-way bypass valve of the excavator hydraulic system as described in claim 2, characterized in that, A support seat is provided at the end of the guide rod away from the valve body. The support spring and the temperature control spring are both sleeved on the outside of the guide rod, and the ends of both of them away from the valve body abut against the support seat.

4. The one-way bypass valve of the excavator hydraulic system as described in claim 3, characterized in that, The support seat is sleeved on the guide rod to give the support seat the freedom to move along the extension direction of the guide rod. A support nut is screwed onto the guide rod and abuts against the side of the support seat away from the valve body.

5. The one-way bypass valve of the excavator hydraulic system as described in claim 3, characterized in that, The valve core has a first groove recessed towards the valve body on its end face away from the valve body, and the support base has a second groove recessed away from the valve body. The two ends of the temperature control spring are respectively embedded in the first groove and the second groove. At a predetermined temperature, the two ends of the temperature control spring abut against the inner end wall of the first groove and the inner end wall of the second groove, respectively.

6. The one-way bypass valve of the excavator hydraulic system as described in claim 5, characterized in that, One end of the support spring abuts against the valve plate, and the other end abuts against the end face of the support seat near the valve body. A spacer is provided between the valve core and the support seat outside the guide rod. The temperature control spring is located inside the spacer, and the support spring is sleeved outside the spacer.

7. The one-way bypass valve of the excavator hydraulic system as described in claim 2, characterized in that, A bracket is formed in the middle of the valve body, and a threaded hole is provided on the bracket. The guide rod passes through the threaded hole to be fixedly engaged with the valve body.

8. The one-way bypass valve of the excavator hydraulic system as described in claim 7, characterized in that, The valve body includes an annular portion surrounding the support, and multiple connecting ribs extending radially along the valve body are provided between the annular portion and the support, with a flow channel formed between adjacent connecting ribs.

9. An excavator hydraulic system, characterized in that, The one-way bypass valve of the excavator hydraulic system as described in any one of claims 1-8.

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